78528829 has 2 divisors, whose sum is σ = 78528830. Its totient is φ = 78528828.

The previous prime is 78528787. The next prime is 78528833. The reversal of 78528829 is 92882587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67272804 + 11256025 = 8202^2 + 3355^2 .

It is a cyclic number.

It is not a de Polignac number, because 78528829 - 2¹⁷ = 78397757 is a prime.

It is a super-2 number, since 2×78528829² = 12333553968222482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78528889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39264414 + 39264415.

It is an arithmetic number, because the mean of its divisors is an integer number (39264415).

Almost surely, 2^78528829 is an apocalyptic number.

It is an amenable number.

78528829 is a deficient number, since it is larger than the sum of its proper divisors (1).

78528829 is an equidigital number, since it uses as much as digits as its factorization.

78528829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 49.

The square root of 78528829 is about 8861.6493385825. The cubic root of 78528829 is about 428.2292949169.

The spelling of 78528829 in words is "seventy-eight million, five hundred twenty-eight thousand, eight hundred twenty-nine".